Auris Medical Holding Ltd. announced with its affiliate Altamira Medica AG the initiation of a clinical investigation of AM-301 in allergic rhinitis. The clinical investigation is an open-label randomized cross-over study that will enroll 36 patients with allergic rhinitis to grass pollen. Study participants will be administered a single dose of AM-301 nasal spray or a comparator product (one puff into each nostril) prior to controlled pollen exposure for four hours in an allergen challenge chamber. The challenge will be repeated with the alternate treatment following a wash-out period. The difference in the Total Nasal Symptom Score (TNSS) between the two treatments over the 4-hour exposure will serve as the primary efficacy endpoint; the investigation shall demonstrate clinical non-inferiority of AM-301 to the comparator product. About AM-301: AM-301 is a drug-free nasal spray for personal protection against airborne viruses and allergens. Upon application into the nose, AM-301 forms a protective gel layer on the nasal mucosa. This thin film is designed to prevent the contact of viruses or allergens with cells; in addition, the composition serves to bind such particles and help with their discharge. Together, this is designed to reduce the risk of upper respiratory infections and promote alleviation of allergic symptoms.